Five-Point Inspection: 2013 Infiniti M35h

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5. Lane keep assist is subtle, though it gets confused

The automatic lane keep assist system works subtly by pulling on the brakes slightly to bring the car back to the center of the lane when one of the road lines is touched. It is not an intrusive system, and never once did it seem like it was overcorrecting, or doing anything counter intuitive to what the driver would want. For the better part of three minutes, the M35h drove itself (on a flat straight highway), but the system isn’t fool proof.

Cracked and faded lines are the first obstacle, as the car can no longer see the boundaries it is supposed to keep. Even double yellow lines or dotted white lines proved to be a little confusing for the system, which sometimes reacted to them and sometimes didn’t.

Don’t count on the lane-keep assist to drive, but as a just in case system, it functions in the background with minimal driver interference, exactly as it should. And for the perpetually sleepy driver, it could save a life.